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<a name="Invoking-Gcov_002dtool"></a>
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<a name="Invoking-gcov_002dtool"></a>
<h3 class="section">11.2 Invoking <code>gcov-tool</code></h3>

<div class="smallexample">
<pre class="smallexample">gcov-tool <span class="roman">[</span><var>global-options</var><span class="roman">]</span> SUB_COMMAND <span class="roman">[</span><var>sub_command-options</var><span class="roman">]</span> <var>profile_dir</var>
</pre></div>

<p><code>gcov-tool</code> accepts the following options:
</p>

<dl compact="compact">
<dt><code>-h</code></dt>
<dt><code>--help</code></dt>
<dd><p>Display help about using <code>gcov-tool</code> (on the standard output), and
exit without doing any further processing.
</p>
</dd>
<dt><code>-v</code></dt>
<dt><code>--version</code></dt>
<dd><p>Display the <code>gcov-tool</code> version number (on the standard output),
and exit without doing any further processing.
</p>
</dd>
<dt><code>merge</code></dt>
<dd><p>Merge two profile directories.
</p><dl compact="compact">
<dt><code>-o <var>directory</var></code></dt>
<dt><code>--output <var>directory</var></code></dt>
<dd><p>Set the output profile directory. Default output directory name is
<var>merged_profile</var>.
</p>
</dd>
<dt><code>-v</code></dt>
<dt><code>--verbose</code></dt>
<dd><p>Set the verbose mode.
</p>
</dd>
<dt><code>-w <var>w1</var>,<var>w2</var></code></dt>
<dt><code>--weight <var>w1</var>,<var>w2</var></code></dt>
<dd><p>Set the merge weights of the <var>directory1</var> and <var>directory2</var>,
respectively. The default weights are 1 for both.
</p></dd>
</dl>

</dd>
<dt><code>merge-stream</code></dt>
<dd><p>Collect profiles with associated filenames from a <em>gcfn</em> and <em>gcda</em>
data stream.  Read the stream from the file specified by <var>file</var> or from
<samp>stdin</samp>.  Merge the profiles with associated profiles in the host
filesystem.  Apply the optional weights while merging profiles.
</p>
<p>For the generation of a <em>gcfn</em> and <em>gcda</em> data stream on the target
system, please have a look at the <code>__gcov_filename_to_gcfn()</code> and
<code>__gcov_info_to_gcda()</code> functions declared in <code>#include &lt;gcov.h&gt;</code>.
</p><dl compact="compact">
<dt><code>-v</code></dt>
<dt><code>--verbose</code></dt>
<dd><p>Set the verbose mode.
</p>
</dd>
<dt><code>-w <var>w1</var>,<var>w2</var></code></dt>
<dt><code>--weight <var>w1</var>,<var>w2</var></code></dt>
<dd><p>Set the merge weights of the profiles from the <em>gcfn</em> and <em>gcda</em> data
stream and the associated profiles in the host filesystem, respectively.  The
default weights are 1 for both.
</p></dd>
</dl>

</dd>
<dt><code>rewrite</code></dt>
<dd><p>Read the specified profile directory and rewrite to a new directory.
</p><dl compact="compact">
<dt><code>-n <var>long_long_value</var></code></dt>
<dt><code>--normalize &lt;long_long_value&gt;</code></dt>
<dd><p>Normalize the profile. The specified value is the max counter value
in the new profile.
</p>
</dd>
<dt><code>-o <var>directory</var></code></dt>
<dt><code>--output <var>directory</var></code></dt>
<dd><p>Set the output profile directory. Default output name is <var>rewrite_profile</var>.
</p>
</dd>
<dt><code>-s <var>float_or_simple-frac_value</var></code></dt>
<dt><code>--scale <var>float_or_simple-frac_value</var></code></dt>
<dd><p>Scale the profile counters. The specified value can be in floating point value,
or simple fraction value form, such 1, 2, 2/3, and 5/3.
</p>
</dd>
<dt><code>-v</code></dt>
<dt><code>--verbose</code></dt>
<dd><p>Set the verbose mode.
</p></dd>
</dl>

</dd>
<dt><code>overlap</code></dt>
<dd><p>Compute the overlap score between the two specified profile directories.
The overlap score is computed based on the arc profiles. It is defined as
the sum of min (p1_counter[i] / p1_sum_all, p2_counter[i] / p2_sum_all),
for all arc counter i, where p1_counter[i] and p2_counter[i] are two
matched counters and p1_sum_all and p2_sum_all are the sum of counter
values in profile 1 and profile 2, respectively.
</p>
<dl compact="compact">
<dt><code>-f</code></dt>
<dt><code>--function</code></dt>
<dd><p>Print function level overlap score.
</p>
</dd>
<dt><code>-F</code></dt>
<dt><code>--fullname</code></dt>
<dd><p>Print full gcda filename.
</p>
</dd>
<dt><code>-h</code></dt>
<dt><code>--hotonly</code></dt>
<dd><p>Only print info for hot objects/functions.
</p>
</dd>
<dt><code>-o</code></dt>
<dt><code>--object</code></dt>
<dd><p>Print object level overlap score.
</p>
</dd>
<dt><code>-t <var>float</var></code></dt>
<dt><code>--hot_threshold &lt;float&gt;</code></dt>
<dd><p>Set the threshold for hot counter value.
</p>
</dd>
<dt><code>-v</code></dt>
<dt><code>--verbose</code></dt>
<dd><p>Set the verbose mode.
</p></dd>
</dl>

</dd>
</dl>



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